Fix Issue

Author: mr-zepol

src/main/java/org/cyclonedx/model/component/evidence/Occurrence.java

@@ -30,7 +30,7 @@ public class Occurrence extends ExtensibleElement
   private Integer offset;
 
   @VersionFilter(Version.VERSION_16)
-  private Integer symbol;
+  private String symbol;
 
   @VersionFilter(Version.VERSION_16)
   private String additionalContext;
@@ -67,11 +67,11 @@ public void setOffset(final Integer offset) {
     this.offset = offset;
   }
 
-  public Integer getSymbol() {
+  public String getSymbol() {
     return symbol;
   }
 
-  public void setSymbol(final Integer symbol) {
+  public void setSymbol(final String symbol) {
     this.symbol = symbol;
   }
 

src/test/java/org/cyclonedx/parsers/AbstractParserTest.java

@@ -680,9 +680,9 @@ private void assertEvidence(final Evidence evidence, final Version version) {
     assertEquals("http://www.apache.org/licenses/LICENSE-2.0",
         evidence.getLicenseChoice().getLicenses().get(0).getUrl());
 
-    if (version == Version.VERSION_15) {
+    if (version.getVersion() >= Version.VERSION_15.getVersion()) {
       assertCallStack(evidence.getCallstack());
-      assertOccurrences(evidence.getOccurrences());
+      assertOccurrences(evidence.getOccurrences(), version);
       assertEquals(1, evidence.getIdentities().size());
       assertIdentifiers(evidence.getIdentities().get(0), version);
     }
@@ -693,12 +693,16 @@ private void assertEvidence(final Evidence evidence, final Version version) {
     }
   }
 
-  private void assertOccurrences(final List<Occurrence> occurrences){
+  private void assertOccurrences(final List<Occurrence> occurrences, Version version){
     assertEquals(occurrences.size(), 1);
     Occurrence occurrence = occurrences.get(0);
 
     assertNotNull(occurrence.getBomRef());
     assertNotNull(occurrence.getLocation());
+
+    if (version.getVersion() >= Version.VERSION_16.getVersion()) {
+      assertNotNull(occurrence.getSymbol());
+    }
   }
 
   private void assertCallStack(final Callstack callstack){

src/test/resources/1.6/valid-evidence-1.6.json

@@ -46,7 +46,8 @@
         "occurrences": [
           {
             "bom-ref": "d6bf237e-4e11-4713-9f62-56d18d5e2079",
-            "location": "/path/to/component"
+            "location": "/path/to/component",
+            "symbol": "test"
           },
           {
             "bom-ref": "b574d5d1-e3cf-4dcd-9ba5-f3507eb1b175",

src/test/resources/1.6/valid-evidence-1.6.xml

@@ -40,6 +40,7 @@
                 <occurrences>
                     <occurrence bom-ref="d6bf237e-4e11-4713-9f62-56d18d5e2079">
                         <location>/path/to/component</location>
+                        <symbol>test</symbol>
                     </occurrence>
                     <occurrence bom-ref="b574d5d1-e3cf-4dcd-9ba5-f3507eb1b175">
                         <location>/another/path/to/component</location>